A motorcyclist remains in a serious but stable condition following a crash on Oxford's eastern bypass.
The 49-year-old woman was taken to hospital after a collision on the southbound carriageway between the Green Road roundabout and Horspath Driftway junction on Saturday at about 8am.
Police are appealing for information from motorists who were on the bypass at the time of the crash.
They are keen to speak to drivers of an old-style Audi and rusty Transit van who officers believe were witnesses to the collision.
A 39-year-old man arrested on suspicion of dangerous driving has been released on police bail until Tuesday, June 26.
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